Glass-ceramic and laminated ceramic electronic components

By optimizing the ratio of SiO2/B2O3 and Al2O3/ZnO, and adding appropriate amounts of TiO2, ZrO2, SnO2, SrO, etc., the problems of dielectric properties and thermal expansion coefficient caused by unstable boron content were solved, resulting in a glass-ceramic material with low dielectric loss and high thermal expansion, suitable for electronic devices.

CN115916717BActive Publication Date: 2026-07-17MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
MURATA MFG CO LTD
Filing Date
2021-06-14
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The boron content in existing low-temperature sintered substrate glass-ceramic materials is unstable, resulting in high dielectric loss, large temperature variation of dielectric constant, and low coefficient of thermal expansion, making them unsuitable for use in electronic devices such as filters.

Method used

Glass-ceramic materials containing Si, B, Al, and Zn are used, with the weight ratio of SiO2/B2O3 controlled to be above 1.21 and the weight ratio of Al2O3/ZnO controlled to be 0.8 to 1.3. TiO2, ZrO2, SnO2, SrO, etc. are added as aggregates to optimize dielectric properties and coefficient of thermal expansion.

Benefits of technology

A glass-ceramic with low boron content has been developed, exhibiting low dielectric constant and dielectric loss, low temperature dependence of dielectric constant, and high coefficient of thermal expansion, making it suitable for low-temperature sintering and high-frequency electrical signal transmission.

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Abstract

A glass-ceramic comprising a glass containing Si, B, Al, and Zn, and a glass-ceramic with a core material, wherein the glass contains 20% to 55% by weight of SiO2, 15% to 30% by weight of B2O3, a SiO2 to B2O3 weight ratio (SiO2 / B2O3) of 1.21 or more, and an Al2O3 to ZnO weight ratio (Al2O3 / ZnO) of 0.8 to 1.3. The core material, relative to the weight of the glass-ceramic, comprises 20% to 50% by weight of SiO2, 1% to 10% by weight of TiO2, less than 3% by weight of ZrO2, and less than 1% by weight of ZnO. The contents of TiO2, ZrO2, SnO2, and SrO in the glass are all 0% to 5% by weight.
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